A railcar bogie (100) according to the present invention includes: a cross beam (31) configured to support a carbody (101) of a railcar; wheels (10) arranged at both railcar width direction sides of the bogie to be lined up in a railcar longitudinal direction at each of the sides; a pair of front and rear axles (11) respectively arranged at a front side and rear side in the railcar longitudinal direction so as to sandwich the cross beam (31) and extend in a railcar width direction, each of the axles (11) connecting the wheels (10) located at a left side and right side in the railcar width direction; bearings (12) arranged at both railcar width direction sides of each of the axles (11) and configured to rotatably support the axle (11); axle box portions (20) coupled to the cross beam (31) via elastic members and each configured to store the bearing (12); and plate spring portions (40) extending in the railcar longitudinal direction so as to respectively support both railcar width direction end portions of the cross beam (31), both railcar longitudinal direction end portions of each of the plate spring portions being respectively supported by the axle box portions (20). Each of the axle box portions (20) includes a supporting surface (26) that supports the plate spring portion (40) such that the plate spring portion (20) is relatively movable and that is inclined toward a longitudinal direction middle portion of the plate spring portion.